REGULATORY CAPITAL REQUIREMENTS (Details) $ in Thousands	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Company (consolidated) [Member]
Total capital (to risk weighted assets):
Actual	$ 2,262,740	$ 1,374,349
Actual Ratio	0.1604	0.1513
Capital Required for Capital Adequacy	$ 1,128,900	$ 726,482
For Capital Adequacy Purposes Ratio	0.080	0.080
Common Equity Tier One Capital	$ 2,017,497	$ 1,150,177
Common Equity tier One Capital to Risk Weighted Assets	14.30%	12.67%
Common Equity Tier One Capital Required for Capital Adequacy	$ 635,006	$ 408,646
Common Equity Tier One Capital for Capitalized Adequacy to Risk Weighted Assets	4.50%	4.50%
Tier 1 capital (to risk weighted assets):
Actual	$ 2,017,497	$ 1,211,177
Actual Ratio	0.1430	0.1334
For Capital Adequacy Purposes	$ 846,675	$ 544,861
For Capital Adequacy Purposes Ratio	0.060	0.060
Tier 1 capital (to average assets):
Actual	$ 2,017,497	$ 1,211,177
Actual Ratio	0.1203	0.0956
For Capital Adequacy Purposes	$ 670,659	$ 506,805
For Capital Adequacy Purposes Ratio	0.040	0.040
Bank [Member]
Total capital (to risk weighted assets):
Actual	$ 2,083,689	$ 1,320,056
Actual Ratio	0.1477	0.1454
Capital Required for Capital Adequacy	$ 1,128,536	$ 726,313
For Capital Adequacy Purposes Ratio	0.080	0.080
To Be Well Capitalized Under Prompt Corrective Action Provisions	$ 1,410,670	$ 907,892
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	0.100	0.100
Common Equity Tier One Capital	$ 1,949,237	$ 1,206,566
Common Equity tier One Capital to Risk Weighted Assets	13.82%	13.29%
Common Equity Tier One Capital Required for Capital Adequacy	$ 634,801	$ 408,551
Common Equity Tier One Capital for Capitalized Adequacy to Risk Weighted Assets	4.50%	4.50%
Common Equity Tier 1 Capital to be Well Capitalized	$ 916,935	$ 590,130
Common Equity Tier One Capital to be Well Capitalized to Risk Weighted Assets	6.50%	6.50%
Tier 1 capital (to risk weighted assets):
Actual	$ 1,949,237	$ 1,206,566
Actual Ratio	0.1382	0.1329
For Capital Adequacy Purposes	$ 846,402	$ 544,735
For Capital Adequacy Purposes Ratio	0.060	0.060
To Be Well Capitalized Under Prompt Corrective Action Provisions	$ 1,128,536	$ 726,313
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	0.080	0.080
Tier 1 capital (to average assets):
Actual	$ 1,949,237	$ 1,206,566
Actual Ratio	0.1162	0.0954
For Capital Adequacy Purposes	$ 670,827	$ 505,747
For Capital Adequacy Purposes Ratio	0.040	0.040
To Be Well Capitalized Under Prompt Correction Action Provisions	$ 838,534	$ 632,184
To Be Well Capitalized Under Prompt Correction Action Provisions Ratio	0.050	0.050